How to play audio in background with Swift? - ios

Question

As you see I'm streaming an audio broadcast. But when I press the home button and exit the app streaming stops or I cannot hear. How can I continue streaming in background and listen it from lock screen?
ViewController.Swift
import UIKit
import AVFoundation
import MediaPlayer
import GoogleMobileAds
class ViewController: UIViewController, GADInterstitialDelegate {
#IBOutlet weak var exitMapButton: UIButton!
#IBOutlet weak var radarMap: UIWebView!
var interstitial: GADInterstitial!
func createAndLoadInterstitial() -> GADInterstitial {
var interstitial = GADInterstitial(adUnitID: "adUnitID-XXXX")
interstitial.delegate = self
interstitial.loadRequest(GADRequest())
return interstitial
}
func getAd(){
if (self.interstitial.isReady)
{
self.interstitial.presentFromRootViewController(self)
self.interstitial = self.createAndLoadInterstitial()
}
}
#IBOutlet weak var ataturkButton: UIButton!
#IBOutlet weak var sabihaButton: UIButton!
#IBOutlet weak var esenbogaButton: UIButton!
#IBOutlet weak var weatherButton: UIButton!
#IBOutlet weak var statusLabel: UILabel!
#IBOutlet weak var playButton: UIButton!
#IBOutlet weak var webViewButton: UIButton!
var googleBannerView: GADBannerView!
override func viewDidLoad() {
super.viewDidLoad()
}
class PlayerAv {
var audioLink: String?
var player: AVPlayer
init(link: String) {
self.audioLink = link
self.player = AVPlayer(URL: NSURL(string: link))
}
}
var myPlayer = PlayerAv(link: "http://somewebsite.com/abc.pls")
var setTowerState = ""
#IBAction func sliderValueChanged(sender: UISlider) {
var currentValue = Float(sender.value)
println(currentValue)
myPlayer.player.volume = currentValue
}
#IBAction func getWeatherWindow(sender: AnyObject) {
UIApplication.sharedApplication().openURL(NSURL(string: "http://somewebpage.com")!)
println("Directed to weather page")
}
#IBAction func changeToAtaturk() {
myPlayer.player.pause()
myPlayer = PlayerAv(link: "http://somewebsite.com/abc.pls")
myPlayer.audioLink == ""
println("\(myPlayer.audioLink!)--a")
playButton.setTitle("Pause", forState: UIControlState.Normal)
myPlayer.player.play()
setTowerState = "ataturk"
statusLabel.text = "Status: Playing, LTBA"
}
#IBAction func changeToEsenboga() {
myPlayer.player.pause()
myPlayer = PlayerAv(link: "http://somewebsite.com/def.pls")
println("\(myPlayer.audioLink!)--a")
playButton.setTitle("Pause", forState: UIControlState.Normal)
myPlayer.player.play()
setTowerState = "esenboga"
statusLabel.text = "Status: Playing, LTAC"
}
#IBAction func changeToSabiha() {
myPlayer.player.pause()
myPlayer = PlayerAv(link: "http://somewebsite.com/efg.pls")
println("\(myPlayer.audioLink!)--a")
playButton.setTitle("Pause", forState: UIControlState.Normal)
myPlayer.player.play()
setTowerState = "sabiha"
statusLabel.text = "Status: Playing, LTFJ"
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func playButtonPressed(sender: AnyObject) {
toggle()
}
func toggle() {
if playButton.titleLabel?.text == "Play" {
playRadio()
println("Playing")
statusLabel.text = "Status: Playing"
} else {
pauseRadio()
println("Paused")
statusLabel.text = "Status: Paused"
}
}
func playRadio() {
myPlayer.player.play()
playButton.setTitle("Pause", forState: UIControlState.Normal)
}
func pauseRadio() {
myPlayer.player.pause()
playButton.setTitle("Play", forState: UIControlState.Normal)
}
}

Answer 1

You need to set your app Capabilities Background Modes (Audio and AirPlay) and set your AVAudioSession category to AVAudioSessionCategoryPlayback and set it active
From Xcode 11.4 • Swift 5.2
do {
try AVAudioSession.sharedInstance().setCategory(.playback, mode: .default, options: [.mixWithOthers, .allowAirPlay])
print("Playback OK")
try AVAudioSession.sharedInstance().setActive(true)
print("Session is Active")
} catch {
print(error)
}

Answer 2

Xcode 10.2.1 Swift 4
Please add the following code in your AppDelegate
func application(_ application: UIApplication, willFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey : Any]? = nil) -> Bool {
do {
try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback, mode: AVAudioSessionModeDefault, options: [.mixWithOthers, .allowAirPlay])
print("Playback OK")
try AVAudioSession.sharedInstance().setActive(true)
print("Session is Active")
} catch {
print(error)
}
return true
}
Note: - Please configure options as required. E.g to stop a background audio while a video file being played add
options: [.allowAirPlay, .defaultToSpeaker]
And don't forget to enable audio and airplay in Background mode

Answer 3

Only paste on the viewDidload
let path = Bundle.main.path(forResource:"Bismallah", ofType: "mp3")
do{
try playerr = AVAudioPlayer(contentsOf: URL(fileURLWithPath: path!))
} catch {
print("File is not Loaded")
}
let session = AVAudioSession.sharedInstance()
do{
try session.setCategory(AVAudioSessionCategoryPlayback)
}
catch{
}
player.play()

Answer 4

Swift 5 Xcode 11.2.1
Add this code where you have initialized the AudioPlayer.
audioPlayer.delegate = self
audioPlayer.prepareToPlay()
let audioSession = AVAudioSession.sharedInstance()
do{
try audioSession.setCategory(AVAudioSession.Category.playback)
}
catch{
fatalError("playback failed")
}